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<pre><code><span id="1" class="l"><a class="l" href="#1"> 1: </a><span class="xlang">&lt;?php</span>
</span><span id="2" class="l"><a class="l" href="#2"> 2: </a><span class="php-keyword1">require_once</span>(<span class="php-var">$_SERVER</span>[<span class="php-quote">'DOCUMENT_ROOT'</span>] . <span class="php-quote">'/lib/config.php'</span>);
</span><span id="3" class="l"><a class="l" href="#3"> 3: </a>@<span class="php-keyword2">session_start</span>(); 
</span><span id="4" class="l"><a class="l" href="#4"> 4: </a><span class="php-comment">//if (isset($_SESSION['captcha'])){</span>
</span><span id="5" class="l"><a class="l" href="#5"> 5: </a><span class="php-comment">//    unset($_SESSION['captcha']);</span>
</span><span id="6" class="l"><a class="l" href="#6"> 6: </a><span class="php-comment">//}</span>
</span><span id="7" class="l"><a class="l" href="#7"> 7: </a><span class="php-comment">//header(&quot;Expires: Mon, 26 Jul 1997 05:00:00 GMT&quot;);  </span>
</span><span id="8" class="l"><a class="l" href="#8"> 8: </a><span class="php-keyword2">header</span>(<span class="php-quote">&quot;Last-Modified: &quot;</span> . <span class="php-keyword2">gmdate</span>(<span class="php-quote">&quot;D, d M Y H:i:s&quot;</span>) . <span class="php-quote">&quot; GMT&quot;</span>);  
</span><span id="9" class="l"><a class="l" href="#9"> 9: </a><span class="php-keyword2">header</span>(<span class="php-quote">&quot;Cache-Control: no-store, no-cache, must-revalidate&quot;</span>);  
</span><span id="10" class="l"><a class="l" href="#10">10: </a><span class="php-keyword2">header</span>(<span class="php-quote">&quot;Cache-Control: post-check=0, pre-check=0&quot;</span>, <span class="php-keyword1">false</span>); 
</span><span id="11" class="l"><a class="l" href="#11">11: </a><span class="php-keyword2">header</span>(<span class="php-quote">&quot;Pragma: no-cache&quot;</span>);  
</span><span id="12" class="l"><a class="l" href="#12">12: </a>
</span><span id="13" class="l"><a class="l" href="#13">13: </a><span class="php-keyword1">function</span> <a id="__generateRandom" href="#__generateRandom">_generateRandom</a>(<span class="php-var">$length</span>=<span class="php-num">6</span>) 
</span><span id="14" class="l"><a class="l" href="#14">14: </a>{ 
</span><span id="15" class="l"><a class="l" href="#15">15: </a>    <span class="php-var">$_rand_src</span> = <span class="php-keyword1">array</span>( 
</span><span id="16" class="l"><a class="l" href="#16">16: </a>        <span class="php-keyword1">array</span>(<span class="php-num">48</span>,<span class="php-num">57</span>) <span class="php-comment">//digits </span>
</span><span id="17" class="l"><a class="l" href="#17">17: </a>        , <span class="php-keyword1">array</span>(<span class="php-num">97</span>,<span class="php-num">122</span>) <span class="php-comment">//lowercase chars </span>
</span><span id="18" class="l"><a class="l" href="#18">18: </a><span class="php-comment">//        , array(65,90) //uppercase chars </span>
</span><span id="19" class="l"><a class="l" href="#19">19: </a>    ); 
</span><span id="20" class="l"><a class="l" href="#20">20: </a>    <span class="php-keyword2">srand</span> ((double) <span class="php-keyword2">microtime</span>() * <span class="php-num">1000000</span>); 
</span><span id="21" class="l"><a class="l" href="#21">21: </a>    <span class="php-var">$random_string</span> = <span class="php-quote">&quot;&quot;</span>; 
</span><span id="22" class="l"><a class="l" href="#22">22: </a>    <span class="php-keyword1">for</span>(<span class="php-var">$i</span>=<span class="php-num">0</span>;<span class="php-var">$i</span>&lt;<span class="php-var">$length</span>;<span class="php-var">$i</span>++){ 
</span><span id="23" class="l"><a class="l" href="#23">23: </a>        <span class="php-var">$i1</span>=<span class="php-keyword2">rand</span>(<span class="php-num">0</span>,<span class="php-keyword2">sizeof</span>(<span class="php-var">$_rand_src</span>)-<span class="php-num">1</span>); 
</span><span id="24" class="l"><a class="l" href="#24">24: </a>        <span class="php-var">$random_string</span> .= <span class="php-keyword2">chr</span>(<span class="php-keyword2">rand</span>(<span class="php-var">$_rand_src</span>[<span class="php-var">$i1</span>][<span class="php-num">0</span>],<span class="php-var">$_rand_src</span>[<span class="php-var">$i1</span>][<span class="php-num">1</span>])); 
</span><span id="25" class="l"><a class="l" href="#25">25: </a>    } 
</span><span id="26" class="l"><a class="l" href="#26">26: </a>    <span class="php-keyword1">return</span> <span class="php-var">$random_string</span>; 
</span><span id="27" class="l"><a class="l" href="#27">27: </a>} 
</span><span id="28" class="l"><a class="l" href="#28">28: </a>
</span><span id="29" class="l"><a class="l" href="#29">29: </a><span class="php-comment">//$im = imagecreatefromjpeg($_SERVER['DOCUMENT_ROOT'].&quot;/html/images/captcha.jpg&quot;);  </span>
</span><span id="30" class="l"><a class="l" href="#30">30: </a><span class="php-var">$im</span> = <span class="php-keyword2">imagecreatefromjpeg</span>(<span class="php-var">$_SERVER</span>[<span class="php-quote">&quot;DOCUMENT_ROOT&quot;</span>].BASE_IMAGES.<span class="php-quote">&quot;captcha.jpg&quot;</span>);  
</span><span id="31" class="l"><a class="l" href="#31">31: </a><span class="php-var">$rand</span> = _generateRandom(<span class="php-num">3</span>); 
</span><span id="32" class="l"><a class="l" href="#32">32: </a><span class="php-var">$_SESSION</span>[<span class="php-quote">'captcha'</span>] = <span class="php-var">$rand</span>; 
</span><span id="33" class="l"><a class="l" href="#33">33: </a><span class="php-keyword2">ImageString</span>(<span class="php-var">$im</span>, <span class="php-num">5</span>, <span class="php-num">2</span>, <span class="php-num">2</span>, <span class="php-var">$rand</span>[<span class="php-num">0</span>].<span class="php-quote">&quot; &quot;</span>.<span class="php-var">$rand</span>[<span class="php-num">1</span>].<span class="php-quote">&quot; &quot;</span>.<span class="php-var">$rand</span>[<span class="php-num">2</span>].<span class="php-quote">&quot; &quot;</span>, <span class="php-keyword2">ImageColorAllocate</span> (<span class="php-var">$im</span>, <span class="php-num">0</span>, <span class="php-num">0</span>, <span class="php-num">0</span>)); 
</span><span id="34" class="l"><a class="l" href="#34">34: </a><span class="php-var">$rand</span> = _generateRandom(<span class="php-num">3</span>); 
</span><span id="35" class="l"><a class="l" href="#35">35: </a><span class="php-keyword2">ImageString</span>(<span class="php-var">$im</span>, <span class="php-num">5</span>, <span class="php-num">2</span>, <span class="php-num">2</span>, <span class="php-quote">&quot; &quot;</span>.<span class="php-var">$rand</span>[<span class="php-num">0</span>].<span class="php-quote">&quot; &quot;</span>.<span class="php-var">$rand</span>[<span class="php-num">1</span>].<span class="php-quote">&quot; &quot;</span>.<span class="php-var">$rand</span>[<span class="php-num">2</span>], <span class="php-keyword2">ImageColorAllocate</span> (<span class="php-var">$im</span>, <span class="php-num">255</span>, <span class="php-num">0</span>, <span class="php-num">0</span>)); 
</span><span id="36" class="l"><a class="l" href="#36">36: </a><span class="php-keyword2">Header</span> (<span class="php-quote">'Content-type: image/jpeg'</span>); 
</span><span id="37" class="l"><a class="l" href="#37">37: </a><span class="php-keyword2">imagejpeg</span>(<span class="php-var">$im</span>,<span class="php-keyword1">NULL</span>,<span class="php-num">100</span>); 
</span><span id="38" class="l"><a class="l" href="#38">38: </a><span class="php-keyword2">ImageDestroy</span>(<span class="php-var">$im</span>); 
</span><span id="39" class="l"><a class="l" href="#39">39: </a></span><span class="xlang">?&gt;</span></code></pre>

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